2 fans for tool 1

I've recently joined the 3d printing community with a Kossel XL build with a Duet Wifi controlling it. I've printed some small things and wanted to get an upgrade by printing a fanholder so that i can have fans cooling the printed part. I've printed this model and it fits perfectly:https://www.thingiverse.com/thing:780379
But in the wiring/software Im a little bit unsure. Ive connected the hotend fan to one of the always on fan ports and the two other fans to fan port 0 and 1 but only the first on is turning on when I try to print. I didnt quite get how i was supposed to wire two fans to one tool from the wiki. Is it possible? Or can I run both fans of one fan port?